You should read the whole thing. But to whet your appetite, here's a teaser that didn't make the cut because I had gone on too long already:
In its pursuit of justice, then, the government’s primary responsibility is to judge against wrongs and protect against threats to society’s welfare--rather than to provide goods directly. Given the diversity and complexity of society, we ought to retain a robust and healthy modesty about our government’s (or our own!) ability to determine “the common good,” and an even stronger skepticism about the government’s ability to promote it. Best to let it simply emerge from each sphere working at its best in its own area, and allow a nimble but strong government to judge the wrongs it uncovers accordingly.
Matthew Lee Anderson is the Founder and Lead Writer of Mere Orthodoxy. He is the author of Earthen Vessels: Why Our Bodies Matter to our Faith and The End of Our Exploring: A Book about Questioning and the Confidence of Faith. Follow him on Twitter or on Facebook.